Fix framework quickstart env loading and LangChain schema

Author: jdrhyne

examples/README.md

@@ -99,7 +99,7 @@ To run framework integration sketches:
 Install optional framework dependencies first:
 
 ```bash
-npm install @openai/agents @langchain/openai @langchain/core
+npm install @openai/agents @langchain/openai @langchain/core zod
 ```
 
 ```bash

examples/src/framework_langchain.mjs

@@ -1,9 +1,20 @@
+import "dotenv/config";
 import { NutrientClient } from "@nutrient-sdk/dws-client-typescript";
 import { ChatOpenAI } from "@langchain/openai";
 import { tool } from "@langchain/core/tools";
+import { z } from "zod";
+
+const nutrientApiKey = process.env.NUTRIENT_API_KEY;
+if (!nutrientApiKey) {
+  throw new Error("Missing NUTRIENT_API_KEY. Add it to examples/.env before running.");
+}
+
+if (!process.env.OPENAI_API_KEY) {
+  throw new Error("Missing OPENAI_API_KEY. Add it to examples/.env before running.");
+}
 
 const client = new NutrientClient({
-  apiKey: process.env.NUTRIENT_API_KEY ?? "nutr_sk_placeholder",
+  apiKey: nutrientApiKey,
 });
 
 const redactEmails = tool(
@@ -14,13 +25,16 @@ const redactEmails = tool(
   {
     name: "redact_emails",
     description: "Redact email addresses from a document via Nutrient DWS.",
+    schema: z.object({
+      path: z.string().describe("Local path to the input PDF file."),
+    }),
   }
 );
 
 async function main() {
   const model = new ChatOpenAI({
     model: "gpt-4.1-mini",
-    apiKey: process.env.OPENAI_API_KEY ?? "sk-placeholder",
+    apiKey: process.env.OPENAI_API_KEY,
   });
 
   const response = await model.bindTools([redactEmails]).invoke(

examples/src/framework_openai_agents.mjs

@@ -1,8 +1,18 @@
+import "dotenv/config";
 import { NutrientClient } from "@nutrient-sdk/dws-client-typescript";
 import { Agent, Runner, tool } from "@openai/agents";
 
+const nutrientApiKey = process.env.NUTRIENT_API_KEY;
+if (!nutrientApiKey) {
+  throw new Error("Missing NUTRIENT_API_KEY. Add it to examples/.env before running.");
+}
+
+if (!process.env.OPENAI_API_KEY) {
+  throw new Error("Missing OPENAI_API_KEY. Add it to examples/.env before running.");
+}
+
 const client = new NutrientClient({
-  apiKey: process.env.NUTRIENT_API_KEY ?? "nutr_sk_placeholder",
+  apiKey: nutrientApiKey,
 });
 
 const extractText = tool({